Achill wrote:

> > Let's say we have a unit cube between <0,0,0> and <1,1,1> and a sphere at
> > <0,0,0> with radius 1.  What is the 'vector sum' of these objects?
> 
> As far as I understand the macro
> "Round_Box_Union(PtA, PtB, EdgeRadius)",
> it would be "Round_Box_Union(<0,0,0>, <1,1,1>, 1)".

It would be Round_Box_Union(<-1,-1,-1>, <2,2,2>, 1), because the 
Round_Box macros cut away from the specified box, rather than 
adding to it.

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